Breakthrough in single-photon integration holds promise for quantum computing, cryptography, sensors

https://phys.org/news/2024-02-breakthrough-photon-quantum-cryptography.html

"on-chip integration single-photon sources room temperature... hybrid metal–dielectric bullseye antenna delivers photon directionality... efficient back-excitation of photons by placing emitter within subwavelength hole at antenna's center also enables efficient front coupling emission to low numerical aperture optics or optical fibers... devices containing either colloidal quantum dots or nanodiamonds containing silicon-vacancy centers... front collection efficiencies 70% at as low as 0.5 apertures"

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https://www.eurekalert.org/news-releases/1062486